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Question

In 50 mL of 0.2 M H2A solution, 25 mL of 0.4 M NaOH solution is added at 25oC. The pH of resulting solution is (for H2A,Ka1=106; Ka2=1012)

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Solution

H2A+NaOHNaHAt=050 mL×0.225 mL×0.4 M010 milli mole10 milli molet=t0 milli mole0 milli mole10 milli mole
Ka1>>>Ka2
pKa=[logKa1]
pKa=log(106)
pKa=+6 log10
pKa=6
pKa2=log[Ka2]
pKa2=log1012
pKa2=12
As the salt formed as amphoteric, for amphoteric salts pH can be calculated as
pH=pKa1+pKa22
pH=6+122
pH=9

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